Process Engineering Department, Universidad EAFIT, Medellín, Colombia.
Environmental Engineering Department, Universidad de Medellín, Medellín, Colombia.
Environ Technol. 2020 Jan;41(2):238-250. doi: 10.1080/09593330.2018.1494755. Epub 2018 Jul 20.
In the present study, the decolourization efficiencies of LP-Hg lamp, XeCl and KrCl excilamps at the same power density were compared for the decolourization of dyes in water by UV and UV/HO processes in a batch reactor. Laboratory prototypes of XeCl and KrCl excilamps and a commercial LP-Hg lamp were studied as UV sources. Methylene Blue and Eliamine Blue dyes were used as model pollutants. The effect of the initial concentrations of dye and HO in the TOC removal and kinetic parameters were also studied. The ratio of dye decolourization to the electric power consumption of the KrCl excilamp and LP-Hg lamp for the decolourization of Methylene Blue and Eliamine Blue were evaluated. As a result, the KrCl excilamp showed significantly higher decolourization efficiencies than LP-Hg lamp and XeCl excilamp, but the dye removal rate was significantly slower for Methylene Blue than for Eliamine Blue with this lamp. The KrCl lamp can be an alternative to conventional LP-Hg lamp for the decolourization of dyes by photodegradation, but it depends on the type of dye treated. The addition of HO in a concentration between 0.05 and 0.09%v/v increases significantly the efficiency of the decolourization of Methylene Blue, and further increase does not lead to a higher increase in conversion. The experimental data were fitted to the one phase decay kinetic model with good agreement and the kinetic parameters were reported.
在本研究中，比较了 LP-Hg 灯、XeCl 和 KrCl 准分子灯在相同功率密度下对水中染料进行光解的脱色效率，分别采用 UV 和 UV/HO 工艺在间歇式反应器中进行。研究了 XeCl 和 KrCl 准分子灯的实验室原型和商业 LP-Hg 灯作为 UV 光源。亚甲蓝和埃利胺蓝染料被用作模型污染物。还研究了初始染料浓度和 HO 在 TOC 去除中的影响以及动力学参数。评估了 KrCl 准分子灯和 LP-Hg 灯在脱色过程中亚甲蓝和埃利胺蓝的脱色与电耗比。结果表明，KrCl 准分子灯的脱色效率明显高于 LP-Hg 灯和 XeCl 准分子灯，但对于这种灯，亚甲蓝的染料去除率明显低于埃利胺蓝。KrCl 灯可以替代传统的 LP-Hg 灯用于染料的光降解脱色，但这取决于处理的染料类型。在 0.05%至 0.09%v/v 之间的浓度下添加 HO 可显著提高亚甲蓝的脱色效率，进一步增加浓度不会导致转化率的更高提高。实验数据与单相衰减动力学模型拟合良好，并报告了动力学参数。
